* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    width: 60%;
    margin: 40px auto;
    line-height: 1.5em;
    solid-color: red;
    word-break: break-all;
}
li {
    width: 100%;
    list-style: none;
    padding-left: 20px;
}

h1 {
    margin: 40px 0;
}

.right, .left, p {
    display: inline;
}

.questionItem {
    margin-bottom: 20px;
}

.cankaoAnswer {
    color: brown;
    background-color: floralwhite;
    padding: 10px;
}

.control {
    position: fixed;
    left: 60px;
    top: 40px;
}


.nav {
    position: fixed;
    right: 60px;
    top: 40px;
}

.control button {
    padding: 5px 10px;
}


.nav a {
    display: inline-block;
    width: 60px;
    height: 30px;
    background-color: dodgerblue;
    color: #fff;
    text-align: center;
    margin-bottom: 10px;
    text-decoration: none;
    border-radius: 4px;
    line-height: 30px;
}

.tk_input {
    border: none;
    border-bottom: 1px solid #000;
    width: 100px;
}

@media screen and (max-width: 900px) {
    .control {
        display: flex;
        top: 5px;
        left: 0;
    }

    .nav {
        left: 0;
        top: 60px;
    }

    .nav li {
        padding-left: 0;
    }

    body {
        width: 100%;
        padding-left: 70px;
    }
    .answer-control {
        margin-left: 10px;
    }
}